and mordants increase the color density . I watched a program at BBC about mordant making from seashells at the shores of England. Flat bottomed boats come to the shore and sit to the ground after tidal wave goes and horse carriages carry these shells to the ships. It was one of the biggest industry in England until the 1900s. I think seashell have calcium aluminum inside and oxidised at big burning pits.
Yes , it was alum , alum trade !
Thank you for the tip .

07-27-2010, 02:45 PM

Mustafa Umut Sarac

I contacted with Eastman House , waited 4 weeks , directed to Motion Film Dep. and directed to RIT Rare books librarian and directed to retired Kodak Research Lab. member.

He says he doesnt believe to salts of sulfonic acid dye theory but inorganic pigments. He says he believes to ferro or ferri cyanides for green but no idea about Red.